Simpsons Comics #191
Lisa earns the right to compete as a mathlete, but when the school doesn't have enough money to send her out of state to the semifinals, she joins an unsanctioned, underground, mixed math arts club to raise money for the trip. Meanwhile, Bart tampers with the Kwik-E-Mart Squishee machine, and after the explosive results, finds himself on the fast track for Employee of the Month!
